function [PObjHandle, ZObjHandle] = plotPZmap(main, filterID, axes, color)  % OK

filterToPlot = ['filter' num2str(filterID)];

sys = main.(filterToPlot).transferFunction;

[P,Z] = pzmap(sys);

PObjHandle = plot(axes, real(P), imag(P), 'x', 'Color', color, 'LineWidth',2);
ZObjHandle = plot(axes, real(Z),imag(Z), 'o', 'Color', color, 'LineWidth',2);


end